One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(10,12)(14,15)(17,18)(19,28)(20,26)(21,31)(22,23)(24,27)(25,30)(29,32) involution — undirected(9,10,13,12)(11,14,16,15)(17,19)(18,25)(20,22)(21,29)(23,31)(24,30)(26,32)(27,28)(2,5)(6,7)(9,10,13,12)(11,15,16,14)(17,20,24,21)(18,26,27,31)(19,29,30,22)(23,28,32,25)(1,2)(3,6)(4,5)(7,8)(9,11,13,16)(10,14,12,15)(17,21,24,20)(18,26,27,31)(19,29,30,22)(23,25,32,28)(1,3)(2,6)(4,8)(5,7)(9,12,13,10)(11,15,16,14)(17,22,24,29)(18,23,27,32)(19,20,30,21)(25,31,28,26)(17,23)(18,22)(19,26)(20,28)(21,25)(24,32)(27,29)(30,31) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.